期刊
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
卷 322, 期 5, 页码 E436-E445出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpendo.00439.2021
关键词
appetite; cAMP; DREADD; energy expenditure; MC4R
资金
- Takeda Life Science Foundation
- Japan Society for the Promotion of Science KAKENHI [19H02909, 18K19174]
- Grants-in-Aid for Scientific Research [19H02909, 18K19174] Funding Source: KAKEN
This study demonstrates that G(s) signaling in MC4R-expressing cells regulates energy expenditure, appetite, and locomotor activity.
The melanocortin 4 receptor (MC4R) plays an important role in the regulation of appetite and energy expenditure in humans and rodents. Impairment of MC4R signaling causes severe obesity. MC4R mainly couples to the G-protein G(s). Ligand binding to MC4R activates adenylyl cyclase resulting in increased intracellular cAMP levels. cAMP acts as a secondary messenger, regulating various cellular processes. MC4R can also couple with G(c), and other signaling pathways. Therefore, the contribution of MC4R/G(s) signaling to energy metabolism and appetite remains unclear. To study the effect of G(s) signaling activation in MC4R cells on whole body energy metabolism and appetite, we generated a novel mouse strain that expresses a G(s)-coupled designer receptors exclusively activated by designer drugs [Gs-DREADD (GsD)] selectively in MC4R-expressing cells (GsD-MC4R mice). Chemogenetic activation of the GsD by a designer drug [deschloroclozapine (DCZ); 0.01 similar to 0.1 mg/kg body wt] in MC4R-expressing cells significantly increased oxygen consumption and locomotor activity. In addition, GsD activation significantly reduced the respiratory exchange ratio, promoting fatty acid oxidation, but did not affect core (rectal) temperature. A low dose of DCZ (0.01 mg/kg body wt) did not suppress food intake, but a high dose of DCZ (0.1 mg/kg body wt) suppressed food intake in MC4R-GsD mice, although either DCZ dose (0.01 or 0.1 mg/kg body wt) did not affect food intake in the control mice. In conclusion, the current study demonstrated that the stimulation of G(s) signaling in MC4R-expressing cells increases energy expenditure and locomotor activity and suppresses appetite. NEW & NOTEWORTHY We report that G(s) signaling in melanocortin 4 receptor (MC4R)-expressing cells regulates energy expenditure, appetite, and locomotor activity. These findings shed light on the mechanism underlying the regulation of energy metabolism and locomotor activity by MC4R/cAMP signaling.
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